Precision Devices PD.184C002
Subwoofer
18″ / 457 mm
Nominal diameter
40 Hz
Resonance
0.34
Q factor
98 dB
Sensitivity
± 9.7 mm
Linear excursion
1800 W
Program Power
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Sensitivity (1w, 1m, infinite baffle)
SPL1W
97.6
dB
Frequency response
30 - 500
Hz
Thiele & Small parameters
Resonance frequency (free air)
fS
40.0
Hz
Mechanical quality factor
QMS
5.67
Electrical quality factor
QES
0.36
Total quality factor
QTS
0.34
Large signal parameters
Maximum linear excursion
xmax
9.7
mm
Air volume displaced at xmax
VD
1117
cm³
Power handling
P
900
W
Program power
Pmax
1800
W
Voice Coil
Nominal impedance
Z
8
Ω
DC resistance
RE
5.2
Ω
Inductance (1kHz)
LE
2.31
mH
VC Diameter
102
mm
Winding height
HVC
26
mm
Winding material
Copper Flat Wire
Former material
Glass Fibre
Magnet
Flux density
B
1.1
T
Force factor
Bl
21.0
N/A
Motor constant
Bl/√RE
9.21
N/√W
Air gap height
HAG
13
mm
Weight
3.3
kg
Material
Ceramic
Diaphragm
Effective diameter
383
mm
Effective area
SD
1152
cm²
Moving mass
MMS
112
g
Moving mass (without air load)
MMD
83.5
g
Material
Fibre loaded Paper
Suspensions
Stiffness
KMS
7.09
N/mm
Compliance
CMS
141
µm/N
Equivalent volume to the compliance
VAS
268
L
Mechanical resistance
RMS
4.96
N·s/m
Dimensions
Nominal diameter
18
″
457
mm
Overall diameter
474
mm
Baffle cutout diameter
414
mm
Overall depth
176
mm
Flange thickness
15
mm
Mounting depth
161
mm
Volume occupied by the driver (estimated)
7.3
L
Net weight
15.5
kg
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SD
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SD
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